K
That's rough as.
Sondal make a urethane that will hold 320kgs per 10 cm square its 3rd the price of sika..good stuff..i use it to for bonding car panels.
I'd rather do it properly even if it took me an extra day. Geez mate. Anyway each to their own but I think that's definately rough!! Wait till your out bush and a stick grabs the silicone, rips it off and your sump bleeds dry. That's why it will be an expensive mistake.
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